a665ae3de1
- contributed by Bjorn Swift - adds process accounting, for example counting the number of messages sent, how often the process was preemted and how much time it spent in the run queue. These statistics, along with the current cpu load, are sent back to the user-space scheduler in the Out Of Quantum message. - the user-space scheduler may choose to make use of these statistics when making scheduling decisions. For isntance the cpu load becomes especially useful when scheduling on multiple cores.
398 lines
13 KiB
C
398 lines
13 KiB
C
/* This file contains the main program of MINIX as well as its shutdown code.
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* The routine main() initializes the system and starts the ball rolling by
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* setting up the process table, interrupt vectors, and scheduling each task
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* to run to initialize itself.
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* The routine shutdown() does the opposite and brings down MINIX.
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*
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* The entries into this file are:
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* main: MINIX main program
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* prepare_shutdown: prepare to take MINIX down
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*/
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#include "kernel.h"
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include <a.out.h>
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#include <minix/com.h>
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#include <minix/endpoint.h>
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#include <minix/u64.h>
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#include "proc.h"
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#include "debug.h"
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#include "clock.h"
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#include "hw_intr.h"
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#ifdef CONFIG_SMP
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#include "smp.h"
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#endif
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#ifdef CONFIG_WATCHDOG
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#include "watchdog.h"
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#endif
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#include "spinlock.h"
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/* Prototype declarations for PRIVATE functions. */
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FORWARD _PROTOTYPE( void announce, (void));
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PUBLIC void bsp_finish_booting(void)
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{
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int i;
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#if SPROFILE
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sprofiling = 0; /* we're not profiling until instructed to */
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#endif /* SPROFILE */
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cprof_procs_no = 0; /* init nr of hash table slots used */
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vm_running = 0;
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krandom.random_sources = RANDOM_SOURCES;
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krandom.random_elements = RANDOM_ELEMENTS;
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/* MINIX is now ready. All boot image processes are on the ready queue.
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* Return to the assembly code to start running the current process.
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*/
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/* it should point somewhere */
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get_cpulocal_var(bill_ptr) = get_cpulocal_var_ptr(idle_proc);
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get_cpulocal_var(proc_ptr) = get_cpulocal_var_ptr(idle_proc);
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announce(); /* print MINIX startup banner */
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/*
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* we have access to the cpu local run queue, only now schedule the processes.
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* We ignore the slots for the former kernel tasks
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*/
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for (i=0; i < NR_BOOT_PROCS - NR_TASKS; i++) {
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RTS_UNSET(proc_addr(i), RTS_PROC_STOP);
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}
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/*
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* enable timer interrupts and clock task on the boot CPU
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*/
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if (boot_cpu_init_timer(system_hz)) {
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panic("FATAL : failed to initialize timer interrupts, "
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"cannot continue without any clock source!");
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}
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fpu_init();
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#ifdef CONFIG_WATCHDOG
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if (watchdog_enabled) {
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if (arch_watchdog_init()) {
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printf("WARNING watchdog initialization failed! Disabled\n");
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watchdog_enabled = 0;
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}
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else
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BOOT_VERBOSE(printf("Watchdog enabled\n"););
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}
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#endif
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/* Warnings for sanity checks that take time. These warnings are printed
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* so it's a clear warning no full release should be done with them
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* enabled.
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*/
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#if DEBUG_SCHED_CHECK
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FIXME("DEBUG_SCHED_CHECK enabled");
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#endif
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#if DEBUG_VMASSERT
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FIXME("DEBUG_VMASSERT enabled");
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#endif
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#if DEBUG_PROC_CHECK
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FIXME("PROC check enabled");
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#endif
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DEBUGEXTRA(("cycles_accounting_init()... "));
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cycles_accounting_init();
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DEBUGEXTRA(("done\n"));
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#ifdef CONFIG_SMP
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cpu_set_flag(bsp_cpu_id, CPU_IS_READY);
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machine.processors_count = ncpus;
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machine.bsp_id = bsp_cpu_id;
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#else
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machine.processors_count = 1;
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machine.bsp_id = 0;
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#endif
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switch_to_user();
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NOT_REACHABLE;
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}
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/*===========================================================================*
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* main *
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*===========================================================================*/
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PUBLIC int main(void)
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{
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/* Start the ball rolling. */
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struct boot_image *ip; /* boot image pointer */
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register struct proc *rp; /* process pointer */
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register int i, j;
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int hdrindex; /* index to array of a.out headers */
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phys_clicks text_base;
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vir_clicks text_clicks, data_clicks, st_clicks;
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reg_t ktsb; /* kernel task stack base */
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struct exec e_hdr; /* for a copy of an a.out header */
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size_t argsz; /* size of arguments passed to crtso on stack */
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BKL_LOCK();
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/* Global value to test segment sanity. */
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magictest = MAGICTEST;
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DEBUGEXTRA(("main()\n"));
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proc_init();
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/* Set up proc table entries for processes in boot image. The stacks of the
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* kernel tasks are initialized to an array in data space. The stacks
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* of the servers have been added to the data segment by the monitor, so
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* the stack pointer is set to the end of the data segment. All the
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* processes are in low memory on the 8086. On the 386 only the kernel
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* is in low memory, the rest is loaded in extended memory.
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*/
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/* Task stacks. */
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ktsb = (reg_t) t_stack;
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for (i=0; i < NR_BOOT_PROCS; ++i) {
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int schedulable_proc;
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proc_nr_t proc_nr;
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int ipc_to_m, kcalls;
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ip = &image[i]; /* process' attributes */
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DEBUGEXTRA(("initializing %s... ", ip->proc_name));
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rp = proc_addr(ip->proc_nr); /* get process pointer */
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ip->endpoint = rp->p_endpoint; /* ipc endpoint */
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make_zero64(rp->p_cpu_time_left);
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strncpy(rp->p_name, ip->proc_name, P_NAME_LEN); /* set process name */
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reset_proc_accounting(rp);
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/* See if this process is immediately schedulable.
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* In that case, set its privileges now and allow it to run.
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* Only kernel tasks and the root system process get to run immediately.
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* All the other system processes are inhibited from running by the
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* RTS_NO_PRIV flag. They can only be scheduled once the root system
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* process has set their privileges.
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*/
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proc_nr = proc_nr(rp);
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schedulable_proc = (iskerneln(proc_nr) || isrootsysn(proc_nr));
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if(schedulable_proc) {
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/* Assign privilege structure. Force a static privilege id. */
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(void) get_priv(rp, static_priv_id(proc_nr));
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/* Priviliges for kernel tasks. */
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if(iskerneln(proc_nr)) {
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/* Privilege flags. */
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priv(rp)->s_flags = (proc_nr == IDLE ? IDL_F : TSK_F);
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/* Allowed traps. */
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priv(rp)->s_trap_mask = (proc_nr == CLOCK
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|| proc_nr == SYSTEM ? CSK_T : TSK_T);
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ipc_to_m = TSK_M; /* allowed targets */
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kcalls = TSK_KC; /* allowed kernel calls */
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}
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/* Priviliges for the root system process. */
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else if(isrootsysn(proc_nr)) {
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priv(rp)->s_flags= RSYS_F; /* privilege flags */
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priv(rp)->s_trap_mask= SRV_T; /* allowed traps */
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ipc_to_m = SRV_M; /* allowed targets */
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kcalls = SRV_KC; /* allowed kernel calls */
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priv(rp)->s_sig_mgr = SRV_SM; /* signal manager */
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rp->p_priority = SRV_Q; /* priority queue */
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rp->p_quantum_size_ms = SRV_QT; /* quantum size */
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}
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/* Priviliges for ordinary process. */
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else {
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NOT_REACHABLE;
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}
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/* Fill in target mask. */
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fill_sendto_mask(rp, ipc_to_m);
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/* Fill in kernel call mask. */
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for(j = 0; j < SYS_CALL_MASK_SIZE; j++) {
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priv(rp)->s_k_call_mask[j] = (kcalls == NO_C ? 0 : (~0));
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}
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}
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else {
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/* Don't let the process run for now. */
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RTS_SET(rp, RTS_NO_PRIV | RTS_NO_QUANTUM);
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}
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if (iskerneln(proc_nr)) { /* part of the kernel? */
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if (ip->stksize > 0) { /* HARDWARE stack size is 0 */
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rp->p_priv->s_stack_guard = (reg_t *) ktsb;
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*rp->p_priv->s_stack_guard = STACK_GUARD;
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}
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ktsb += ip->stksize; /* point to high end of stack */
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rp->p_reg.sp = ktsb; /* this task's initial stack ptr */
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hdrindex = 0; /* all use the first a.out header */
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} else {
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hdrindex = 1 + i-NR_TASKS; /* system/user processes */
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}
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/* Architecture-specific way to find out aout header of this
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* boot process.
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*/
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arch_get_aout_headers(hdrindex, &e_hdr);
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/* Convert addresses to clicks and build process memory map */
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text_base = e_hdr.a_syms >> CLICK_SHIFT;
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text_clicks = (vir_clicks) (CLICK_CEIL(e_hdr.a_text) >> CLICK_SHIFT);
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data_clicks = (vir_clicks) (CLICK_CEIL(e_hdr.a_data
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+ e_hdr.a_bss) >> CLICK_SHIFT);
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st_clicks = (vir_clicks) (CLICK_CEIL(e_hdr.a_total) >> CLICK_SHIFT);
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if (!(e_hdr.a_flags & A_SEP))
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{
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data_clicks = (vir_clicks) (CLICK_CEIL(e_hdr.a_text +
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e_hdr.a_data + e_hdr.a_bss) >> CLICK_SHIFT);
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text_clicks = 0; /* common I&D */
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}
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rp->p_memmap[T].mem_phys = text_base;
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rp->p_memmap[T].mem_len = text_clicks;
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rp->p_memmap[D].mem_phys = text_base + text_clicks;
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rp->p_memmap[D].mem_len = data_clicks;
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rp->p_memmap[S].mem_phys = text_base + text_clicks + st_clicks;
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rp->p_memmap[S].mem_vir = st_clicks;
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rp->p_memmap[S].mem_len = 0;
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/* Set initial register values. The processor status word for tasks
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* is different from that of other processes because tasks can
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* access I/O; this is not allowed to less-privileged processes
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*/
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rp->p_reg.pc = 0; /* we cannot start anything else */
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rp->p_reg.psw = (iskerneln(proc_nr)) ? INIT_TASK_PSW : INIT_PSW;
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/* Initialize the server stack pointer. Take it down three words
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* to give crtso.s something to use as "argc", "argv" and "envp".
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*/
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if (isusern(proc_nr)) { /* user-space process? */
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rp->p_reg.sp = (rp->p_memmap[S].mem_vir +
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rp->p_memmap[S].mem_len) << CLICK_SHIFT;
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argsz = 3 * sizeof(reg_t);
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rp->p_reg.sp -= argsz;
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phys_memset(rp->p_reg.sp -
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(rp->p_memmap[S].mem_vir << CLICK_SHIFT) +
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(rp->p_memmap[S].mem_phys << CLICK_SHIFT),
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0, argsz);
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}
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/* scheduling functions depend on proc_ptr pointing somewhere. */
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if(!get_cpulocal_var(proc_ptr))
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get_cpulocal_var(proc_ptr) = rp;
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/* If this process has its own page table, VM will set the
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* PT up and manage it. VM will signal the kernel when it has
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* done this; until then, don't let it run.
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*/
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if(ip->flags & PROC_FULLVM)
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rp->p_rts_flags |= RTS_VMINHIBIT;
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rp->p_rts_flags |= RTS_PROC_STOP;
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rp->p_rts_flags &= ~RTS_SLOT_FREE;
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alloc_segments(rp);
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DEBUGEXTRA(("done\n"));
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}
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#define IPCNAME(n) { \
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assert((n) >= 0 && (n) <= IPCNO_HIGHEST); \
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assert(!ipc_call_names[n]); \
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ipc_call_names[n] = #n; \
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}
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IPCNAME(SEND);
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IPCNAME(RECEIVE);
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IPCNAME(SENDREC);
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IPCNAME(NOTIFY);
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IPCNAME(SENDNB);
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IPCNAME(SENDA);
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/* Architecture-dependent initialization. */
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DEBUGEXTRA(("arch_init()... "));
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arch_init();
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DEBUGEXTRA(("done\n"));
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/* System and processes initialization */
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DEBUGEXTRA(("system_init()... "));
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system_init();
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DEBUGEXTRA(("done\n"));
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#ifdef CONFIG_SMP
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if (config_no_apic) {
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BOOT_VERBOSE(printf("APIC disabled, disables SMP, using legacy PIC\n"));
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smp_single_cpu_fallback();
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} else if (config_no_smp) {
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BOOT_VERBOSE(printf("SMP disabled, using legacy PIC\n"));
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smp_single_cpu_fallback();
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} else {
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smp_init();
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/*
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* if smp_init() returns it means that it failed and we try to finish
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* single CPU booting
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*/
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bsp_finish_booting();
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}
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#else
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/*
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* if configured for a single CPU, we are already on the kernel stack which we
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* are going to use everytime we execute kernel code. We finish booting and we
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* never return here
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*/
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bsp_finish_booting();
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#endif
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NOT_REACHABLE;
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return 1;
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}
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/*===========================================================================*
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* announce *
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*===========================================================================*/
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PRIVATE void announce(void)
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{
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/* Display the MINIX startup banner. */
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printf("\nMINIX %s.%s. "
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#ifdef _SVN_REVISION
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"(" _SVN_REVISION ")\n"
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#endif
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"Copyright 2010, Vrije Universiteit, Amsterdam, The Netherlands\n",
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OS_RELEASE, OS_VERSION);
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printf("MINIX is open source software, see http://www.minix3.org\n");
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}
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/*===========================================================================*
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* prepare_shutdown *
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*===========================================================================*/
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PUBLIC void prepare_shutdown(const int how)
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{
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/* This function prepares to shutdown MINIX. */
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static timer_t shutdown_timer;
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/* Continue after 1 second, to give processes a chance to get scheduled to
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* do shutdown work. Set a watchog timer to call shutdown(). The timer
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* argument passes the shutdown status.
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*/
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printf("MINIX will now be shut down ...\n");
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tmr_arg(&shutdown_timer)->ta_int = how;
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set_timer(&shutdown_timer, get_uptime() + system_hz, minix_shutdown);
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}
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/*===========================================================================*
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* shutdown *
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*===========================================================================*/
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PUBLIC void minix_shutdown(timer_t *tp)
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{
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/* This function is called from prepare_shutdown or stop_sequence to bring
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* down MINIX. How to shutdown is in the argument: RBT_HALT (return to the
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* monitor), RBT_MONITOR (execute given code), RBT_RESET (hard reset).
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*/
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#ifdef CONFIG_SMP
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/*
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* FIXME
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*
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* we will need to stop timers on all cpus if SMP is enabled and put them in
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* such a state that we can perform the whole boot process once restarted from
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* monitor again
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*/
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if (ncpus > 1)
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smp_shutdown_aps();
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#endif
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hw_intr_disable_all();
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stop_local_timer();
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intr_init(INTS_ORIG, 0);
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arch_shutdown(tp ? tmr_arg(tp)->ta_int : RBT_PANIC);
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}
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